public When_Employer_Searched_Successfully() { const string query = "Employer"; _employerService = Substitute.For <IEmployerService>(); var referralService = Substitute.For <IReferralService>(); _employerService.Search(query).Returns(new List <EmployerSearchResultDto> { new EmployerSearchResultDto { CompanyName = "CompanyName1", AlsoKnownAs = "AlsoKnownAs1" }, new EmployerSearchResultDto { CompanyName = "CompanyName2", AlsoKnownAs = "AlsoKnownAs2" } }); var config = new MapperConfiguration(c => c.AddMaps(typeof(EmployerMapper).Assembly)); var mapper = new Mapper(config); var employerController = new EmployerController(_employerService, null, referralService, mapper); _result = employerController.SearchEmployer(query); }